my phone is a samsung galaxy s7 active, version: 891AUCS2BRA7,, the problem is that it does not let me update it to android 8 ,, (I do not get the update by OTA) and try to find some firmware but they tell me they are not safe, , I read maybe it was because I did not activate my cell phone at AT & T but I really do not know what to do, I'm already desperate since I'm not an expert, if you know a solution please tell me